CN111200071B

CN111200071B - Organic light emitting device

Info

Publication number: CN111200071B
Application number: CN201911128220.1A
Authority: CN
Inventors: 申智彻; 徐正大; 金载勋; 俞唱在
Original assignee: LG Display Co Ltd; Industry University Cooperation Foundation IUCF HYU
Current assignee: LG Display Co Ltd; Industry University Cooperation Foundation IUCF HYU
Priority date: 2018-11-20
Filing date: 2019-11-18
Publication date: 2023-04-07
Anticipated expiration: 2039-11-18
Also published as: US11038152B2; CN111200071A; KR20200058987A; US20200161592A1

Abstract

An organic light emitting device is disclosed, comprising a first electrode, a second electrode and an intervening light emitting layer, wherein the light emitting layer comprises a mesogenic polymer based light emitting material and a chiral dopant, wherein the light emitting layer has one face facing the first electrode and an opposite face facing the second electrode, wherein molecules of the mesogenic polymer based light emitting material in one face are oriented in a first predetermined direction and molecules of the mesogenic polymer based light emitting material in the opposite face are oriented in a second predetermined direction different from the first predetermined direction, wherein an angle of the second predetermined direction with respect to the first predetermined direction is defined as a twist angle, and wherein the molecules of the mesogenic polymer based light emitting material are vertically arranged between the one face and the opposite face of the light emitting layer in a spirally twisted manner within the twist angle to form a twisted structure.

Description

Organic light emitting device

Cross Reference to Related Applications

This application claims priority from korean patent application No. 10-2018-0143771, filed by 2018, month 11 and day 20 to the korean intellectual property office, the entire disclosure of which is incorporated herein by reference.

Technical Field

The present disclosure relates to an organic light emitting device.

Background

As display devices increase in size, there is an increasing interest in flat display devices having a small occupancy or footprint. The technology of an organic light emitting display device including an organic light emitting device or an Organic Light Emitting Diode (OLED), which is one of such flat display devices, has been rapidly developed.

In an Organic Light Emitting Diode (OLED), when charges are injected into a light emitting layer formed between an anode and a cathode, pairs of electrons and holes form excitons. Then, light emission may occur when the excitons drop to a ground state. The organic light emitting diode is driven at a voltage lower than that of a conventional display device, has relatively low power consumption, and has excellent color rendering properties, and is suitable for a flexible substrate for use in various applications.

Disclosure of Invention

An object of the present disclosure is to provide an organic light-emitting device having excellent light transmittance and light efficiency in the case of applying a circular polarizer to the device.

Another object of the present disclosure is to provide a method for manufacturing an organic light emitting device having excellent light transmittance and light efficiency in the case of applying a circular polarizer to the device.

The object of the present disclosure is not limited to the above object. In addition to the above objects and advantages, other objects and advantages of the present disclosure may be understood from the following description, and may be more clearly understood from the embodiments of the present disclosure. Further, it will be readily understood that the objects and advantages of the present disclosure may be realized by means of the features and combinations thereof.

In one aspect of the present disclosure, there is provided an organic light emitting device including: a first electrode, a second electrode and a light emitting layer interposed therebetween, wherein the light emitting layer comprises a mesogenic polymer based light emitting material and a chiral dopant, wherein the light emitting layer has one face facing the first electrode and an opposite face facing the second electrode, wherein molecules of the mesogenic polymer based light emitting material in the one face are oriented in a first predetermined direction and molecules of the mesogenic polymer based light emitting material in the opposite face are oriented in a second predetermined direction different from the first predetermined direction, wherein an angle of the second predetermined direction with respect to the first predetermined direction is defined as a twist angle, wherein molecules of the mesogenic polymer based light emitting material are vertically arranged between the one face and the opposite face of the light emitting layer within the twist angle in a spirally twisted manner to form a twisted structure, wherein the twist angle of the light emitting layer is larger than a saturation twist angle of the mesogenic polymer based light emitting material.

In another aspect of the present disclosure, an organic light emitting device is provided, including: a first electrode, a second electrode and a light emitting layer interposed therebetween, wherein the light emitting layer comprises a mesogenic polymer based light emitting material and a chiral dopant, wherein the light emitting layer has one face facing the first electrode and an opposite face facing the second electrode, wherein molecules of the mesogenic polymer based light emitting material in the one face are oriented in a first predetermined direction and molecules of the mesogenic polymer based light emitting material in the opposite face are oriented in a second predetermined direction different from the first predetermined direction, wherein the molecules of the mesogenic polymer based light emitting material are vertically arranged in a twisted manner based on a difference between the first predetermined direction and the second predetermined direction, thereby forming a twisted structure, wherein an angle of the second predetermined direction with respect to the first predetermined direction is defined as a twist angle, wherein the twist angle is in a range of 60 ° to 100 °.

In yet another aspect of the present disclosure, a method for manufacturing an organic light emitting device is presented, the method including: providing a first electrode; forming a hole transport layer on the first electrode; applying an orientation to a top surface of the hole transport layer to form an orientation forming film of the hole transport layer; applying a solution on the alignment forming film and drying the solution to form a temporary light-emitting layer on the hole transport layer, wherein the solution comprises a mesogenic polymer-based light-emitting material and a chiral dopant; applying an orientation to a top surface of the temporary light-emitting layer to have an orientation different from that of the orientation-forming film of the hole-transporting layer; coating a photocurable polymer on the oriented top surface of the temporary light-emitting layer to form a coating layer, and then photocuring the coating layer; heating the temporary light emitting layer to form a light emitting layer having a twisted structure; removing the coating layer; and forming a second electrode over the light emitting layer.

An organic light-emitting device according to the present disclosure includes a light-emitting layer having circular polarized light emission, in which one of right-handed circular polarization and left-handed circular polarization dominates over the other. Further, the circular polarization direction of the light emitted from the light emitting layer and the circular polarization direction of the circular polarizer may be the same. This can improve the light transmittance of the device, thereby improving the light efficiency of the device.

The method for manufacturing an organic light-emitting device according to the present disclosure can realize an organic light-emitting device including a light-emitting layer having circular polarization light emission in which one of right-handed circular polarization and left-handed circular polarization is more dominant than the other.

In addition to the effects described above, specific effects of the present disclosure will be described below in conjunction with the description of specific details to achieve the present disclosure.

Drawings

Fig. 1 is a schematic cross-sectional view of an organic light emitting device according to an example embodiment of the present disclosure.

Fig. 2 is a schematic representation of a twisted structure formed by a mesogenic polymer-based light emitting material in a light emitting layer of an organic light emitting device according to an example embodiment of the present disclosure.

Fig. 3 is a schematic cross-sectional view of an organic light emitting device according to an example embodiment of the present disclosure.

Fig. 4 is a schematic illustration of a method for manufacturing an organic light emitting device according to an example embodiment of the present disclosure.

Fig. 5 is a schematic cross-sectional view of an organic light-emitting device obtained by a method of manufacturing an organic light-emitting device according to an example embodiment of the present disclosure.

Fig. 6 is a schematic cross-sectional view of an organic light emitting display device using an organic light emitting device according to an embodiment of the present disclosure.

Fig. 7 to 10 show optical analysis spectra of the devices according to the examples and comparative examples.

Fig. 11 shows AFM textures obtained from the top surfaces of the light emitting layers manufactured according to the examples and the comparative examples.

Fig. 12 is a schematic view of an experimental apparatus for measuring a twist angle of a light emitting layer of an organic light emitting device according to one embodiment of the present disclosure.

Fig. 13 shows a light transmissive texture image of a sample of the luminescent layer fabricated according to an embodiment.

Detailed Description

For simplicity and clarity of illustration, elements in the figures have not necessarily been drawn to scale. The same reference numbers in different drawings identify the same or similar elements and, thus, perform similar functions. Furthermore, in the following detailed description of the present disclosure, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure. However, it is understood that the disclosure may be practiced without these specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail as not to unnecessarily obscure aspects of the present disclosure.

Examples of various embodiments are further illustrated and described below. It will be understood that the description herein is not intended to limit the claims to the particular embodiments described. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the disclosure as defined by the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used herein, the singular forms are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, integers, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. Expressions such as "at least one of," when preceding a list of elements, can modify the entire list of elements and do not require modification of individual elements in the list.

It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the spirit and scope of the present disclosure.

In addition, it will also be understood that when a first element or layer is referred to as being "on" a second element or layer, the first element may be directly disposed on the second element or may be indirectly disposed on the second element in such a manner that a third element or layer is disposed between the first element or layer and the second element or layer. It will be understood that when an element or layer is referred to as being "connected to" or "coupled to" another element or layer, it can be directly connected or coupled to the other element or layer or one or more intervening elements or layers may be present. In addition, it will also be understood that when an element or layer is referred to as being "between" two elements or layers, it can be the only element or layer between the two elements or layers, or one or more intervening elements or layers may also be present.

Unless otherwise defined, all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the inventive concept belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Hereinafter, an organic light emitting device according to some embodiments of the present disclosure will be described.

In one implementation of the present disclosure, an organic light emitting device is presented, comprising a first electrode, a second electrode and a light emitting layer in between, wherein the light emitting layer comprises a mesogenic polymer based light emitting material and a chiral dopant, wherein the light emitting layer has one face facing the first electrode and an opposite face facing the second electrode, wherein molecules of the mesogenic polymer based light emitting material in the one face are oriented in a first predetermined direction and molecules of the mesogenic polymer based light emitting material in the opposite face are oriented in a second predetermined direction different from the first predetermined direction, wherein an angle of the second predetermined direction with respect to the first predetermined direction is defined as a twist angle, wherein the molecules of the mesogenic polymer based light emitting material are vertically arranged between the one face and the opposite face of the light emitting layer within the twist angle in a helically twisted manner to form a twisted structure, wherein the twist angle of the light emitting layer is larger than a saturation angle of the mesogenic polymer based light emitting material.

In one embodiment, the twist angle may be in the range of 60 ° to 100 °.

As shown in fig. 1, an organic light emitting device 100 according to an embodiment of the present disclosure includes a first electrode 10, a light emitting layer 30, and a second electrode 20. All components of the organic light emitting device 100 according to all embodiments of the present disclosure are operatively coupled and configured.

The light emitting layer 30 includes one face 30a facing the first electrode 10 and an opposite face 30b facing the second electrode 20. The molecules in one face 30a are oriented in a first predetermined direction. The molecules in the opposite face 30b are oriented in a second predetermined direction different from the first predetermined direction. In an embodiment, the molecules of the mesogenic polymer-based luminescent material between one face 30a and the opposite face 30b may be oriented in a third direction different from the first predetermined direction and the second predetermined direction, and the third direction may be different from the first predetermined direction and the second predetermined direction, and the third direction may intersect both the first predetermined direction and the second predetermined direction.

The light-emitting layer 30 comprises a mesogenic polymer based light-emitting material and a chiral dopant. Due to the difference between the orientation of the molecules in one face 30a and the orientation of the molecules in the opposite face 30b, the molecules of the mesogenic polymer-based luminescent material are stacked spirally to form a twisted structure or a spiral stack.

Fig. 2 is a schematic representation of the twisted structure of the mesogenic polymer-based luminescent material in the light emitting layer 30. As shown in fig. 2, the molecules M of the mesogenic polymer-based luminescent material may be elongated. When the thickness direction of the light emitting layer 30 is defined as the Z direction, the directions of the x-y vectors of the length directions of the molecules M of the mesogenic polymer-based light emitting material on the opposite two faces of the light emitting layer 30 are different from each other.

In fig. 2, the direction based on the X-Y vector of the length direction of the molecules M of the mesogenic polymer-based luminescent material in one face 30a is denoted as X-direction, while the direction based on the X-Y vector of the length direction of the molecules M of the mesogenic polymer-based luminescent material in the opposite face 30b is denoted as Y-direction. Due to the difference between the direction X and the direction Y based on the X-Y vector of the length direction of the molecules M of the mesogenic polymer-based luminescent material in the one face 30a and the opposite face 30b, a twisted structure is formed by stacking the molecules M of the mesogenic polymer-based luminescent material in a direction of thickness (Z direction) in a spiral and twisted manner.

The twist angle may be defined as the angle of the Y direction relative to the X direction.

The light emitting layer 30 has a twisted structure to generate and emit light having a circular polarization characteristic. Depending on the structural characteristics of the twisted structure, either right-handed circular polarization or left-handed circular polarization may dominate in the light emitted from the light-emitting layer 30. Depending on the direction of the twist angle, either right-handed circular polarization or left-handed circular polarization may be selected.

As used herein, circular polarization is a concept that includes circular polarization or elliptical polarization. The circular polarization may refer to a case where the vector sum of the x-axis magnetic field and the y-axis magnetic field in the incident plane of the light traveling in the z-axis direction changes circularly, that is, a case where the magnitudes of the x-axis magnetic field and the y-axis magnetic field are exactly the same and the phase difference therebetween is 90 °. Further, elliptical polarization refers to all polarizations except linear polarization and circular polarization. That is, as the combined magnetic field vector rotates and changes in magnitude, the polarization state follows an elliptical shape. This can be defined as elliptical polarization. Further, from the viewpoint of facing an observer right vertically to the light traveling direction, the case where the combined magnetic field vector rotates in the clockwise direction is referred to as right-handed circular polarization, and the case where the combined magnetic field vector rotates in the counterclockwise direction is referred to as left-handed circular polarization.

In the case where a circular polarizer is applied to an organic light-emitting device as an antireflection film, and when light emitted from the light-emitting layer has a circular polarization direction opposite to that of the circular polarizer, the light will not pass through the antireflection film, resulting in deterioration of light transmittance.

In the organic light-emitting device 100, in the case where the light emitted from the light-emitting layer 30 is unbalanced between the right-handed circular polarization and the left-handed circular polarization, and the circular polarization direction dominant between the right-handed circular polarization and the left-handed circular polarization is equal to the circular polarization direction of the circular polarizer, the light emitted from the light-emitting layer 30 may mostly pass through the antireflection film. Accordingly, the organic light emitting device 100 exhibits high light transmittance and may exhibit excellent light efficiency characteristics.

When a circular polarizer is applied to the organic light-emitting device 100 as an antireflection film, the light transmittance of the organic light-emitting device 100 is related to the g-factor. The g factor is calculated by the following relation 1, and indicates the superiority of the dominant one between the right-hand circular polarization and the left-hand circular polarization.

[ relational expression 1]

g factor =2 x (IL-IR)/(IL + IR)

Wherein IL refers to the intensity of light having left-handed circular polarization characteristics; IR refers to the intensity of light having right-handed circular polarization characteristics.

When the g-factor is 0, the right-handed circular polarization and the left-handed circular polarization may be balanced out. When the absolute value of the g-factor increases, either right-handed circular polarization or left-handed circular polarization dominates. The g-factor is generally a value calculated using EL spectroscopy. However, the g-factor may be a value calculated using PL spectra.

As used herein, gPL denotes the g-factor measured using PL spectroscopy, and gEL denotes the g-factor measured using EL spectroscopy.

The organic light emitting layer 30 of the organic light emitting device 100 has a twisted structure having a large twist angle as described above, so that a high g-factor in which right-handed circular polarization or left-handed circular polarization is particularly dominant is realized.

In order to maximize the g-factor, the difference between the molecular orientation X of one face 30a of the light-emitting layer and the molecular orientation Y of the opposite face 30b of the light-emitting layer, i.e., the twist angle θ T, should be large.

In order to impart molecular orientation to one surface 30a of the light-emitting layer, a layer (hole transport layer 40 in fig. 1) in contact therewith is formed as an orientation forming film. Then, a light-emitting layer is formed on top of the alignment forming film through solution treatment. The orientation forming film may have an orientation thereon by applying surface azimuth anchoring energy to the surface of the orientation forming film via rubbing or optical orientation. One face 30a of the light-emitting layer contacting the orientation forming film may be formed to have the same orientation as that of the orientation forming film. The opposite surface 30b of the light emitting layer may be formed to have an orientation such that the orientation thereof and the orientation of the orientation forming film are different from each other. Therefore, the light-emitting layer has a twisted structure therein. The opposite face 30b of the light emitting layer may have an orientation by applying surface-azimuthal anchoring energy to its surface via rubbing or optical orientation to orient the molecules of the mesogenic polymer-based light emitting material in one direction.

After the opposite surface 30b of the light-emitting layer is given an orientation, the orientation can be fixed by an additional process as described below. Then, when the twisted structure of the light emitting layer is formed by the heat treatment, the twist angle θ T of the twisted structure of the light emitting layer may be increased in proportion to the difference between the orientation of the relative orientation forming film and the orientation of the opposite face 30b of the light emitting layer 30.

However, in the case where the mesogenic polymer-based light emitting material alone forms the light emitting layer, and when the difference between the orientation of the orientation forming film and the orientation of the opposite face 30b of the light emitting layer increases to a certain angle, the twist angle θ T of the twisted structure of the light emitting layer no longer increases to be greater than the certain angle and "saturates". This specific angle is referred to as the saturation twist angle θ S of the mesogenic polymer-based luminescent material. The saturation twist angle θ S is determined by the types of the light emitting materials having different elastic moduli. Therefore, the saturation twist angle θ S is the maximum twist angle that a specific mesogenic polymer-based light emitting material can achieve in the light emitting layer.

The twisted structure of the light emitting layer 30 can be realized while maintaining the difference between the orientation of the orientation forming film defining the orientation of the one face 30a and the orientation of the opposite face 30b, particularly while fixing the orientation of the opposite face 30b by a manufacturing method described later. Therefore, the twist angle θ T of the twist structure may be formed to be greater than the saturation twist angle θ S. This will be described in detail in the manufacturing method described later.

Furthermore, since the light emitting layer 30 contains a chiral dopant in addition to the mesogenic polymer-based light emitting material, the chiral dopant may make the twist angle θ T larger than the saturation twist angle θ S of only the mesogenic polymer-based light emitting material.

That is, the light emitting layer 30 uses a chiral dopant in addition to the mesogenic polymer-based light emitting material. Further, the difference between the orientation of the orientation forming film and the orientation of the opposite face 30b of the light emitting layer 30 is made larger than the saturation twist angle θ S of the mesogenic polymer-based light emitting material. In addition, the twisted structure of the light emitting layer 30 is realized in the case where the orientation of the opposite face 30b is fixed by a manufacturing method described later. Finally, the light emitting layer 30 can realize a larger twist angle θ T.

The reason why the saturation twist angle θ S occurs is because the elastic modulus K2 of the mesogenic polymer-based light emitting material affecting the twisted structure is as high as about 10 ^-11 N to 10 ^-10 And N is added. Generally, the polymers have a high modulus of elasticity.

Therefore, by realizing a larger twist angle θ T, the light emitting layer 30 can realize a larger g-factor value.

Specifically, the twist angle θ T of the light emitting layer 30, that is, the angle between the orientation of the one face 30a and the orientation of the opposite face 30b, may be in the range of 60 ° to 100 °.

The twist angle θ T of the light emitting layer 30 can be maintained within the above-defined range by adjusting the orientation of the orientation forming film and the orientation of the opposite surface 30b of the light emitting layer 30, and adjusting the elastic modulus K2, the surface orientation fixing energy, and the thickness of the light emitting layer of the mesogenic polymer-based light emitting material.

In one embodiment of the present disclosure, the organic light-emitting device 100 may have an absolute value of a g-factor of light emitted from the light-emitting layer 30 in a range of 0.01 to 2. In particular, the absolute value of the g-factor may be in the range of 0.4 to 2. Therefore, one of right-handed circular polarization and left-handed circular polarization may be dominant.

According to the present disclosure, in order to measure the twist angle of the light emitting layer 30, we compared the stokes variance measured after passing light linearly polarized in the rubbing direction through the light emitting layer of the twisted structure with the stokes variance calculated by Mueller matrix (Mueller matrix) using the twist angle. The comparison result is then evaluated. The experimental setup for the measurement is schematically shown in fig. 12. In fig. 12, a light emitting layer sample whose twist angle is to be measured is placed at a sample position. The light from the laser is selected to have a wavelength of light that is not absorbed by the light emitting layer. A detailed description of measuring and calculating the Twist angle is disclosed in the article "Control of circulation Polarized Electrical in Induced Twist Structure of Conjugate Polymer, jae-Hoon Kim et al, adv. Mater.2017,29, p1700907".

In one embodiment, the mesogenic polymer based luminescent material may comprise at least one selected from poly (9, 9-dioctylfluorene-co-benzothiadiazole) (F8 BT) and poly (9, 9-dioctyl2, 7-fluorene) (PFO). However, the present disclosure is not limited thereto. The mesogenic polymer-based luminescent material may comprise a polymer having mesogenic and luminescent properties.

The light emitting layer 30 realizes a twist angle thetat exceeding a saturation twist angle thetas of the mesogenic polymer-based light emitting material by including a chiral dopant therein. Therefore, of the light emitted from the light-emitting layer 30, right-handed circular polarization or left-handed circular polarization predominates. The chiral dopant may influence the orientation of the molecules in the mesogenic polymer-based luminescent material surrounding the dopant.

The light emitting layer 30 may include a chiral dopant in an amount ranging from 0.1wt% to 30 wt%. When the light emitting layer 30 includes the chiral dopant within the above-defined range, the chiral dopant may effectively act such that the twist angle θ T of the light emitting layer 30 is greater than the saturation twist angle θ S of the mesogenic polymer-based light emitting material.

The first electrode 10 serves as an anode and feeds holes into the light emitting layer. The first electrode may contain a conductive material having a high work function to facilitate feeding of holes. The first electrode 10 may be made of a conductive material such as Indium Tin Oxide (ITO), indium Zinc Oxide (IZO), or zinc oxide (ZnO).

The second electrode 20 serves as a cathode for injecting electrons, and may be made of a conductive material having a low work function, such as aluminum (Al), magnesium (Mg), or aluminum-magnesium alloy (AlMg).

The orientation forming film may be implemented as the hole transport layer 40. The hole transport layer 40 has an interface with the light emitting layer 30. The interface has an orientation based on rubbing or optical orientation.

The Hole Transport Layer (HTL) 40 contains a hole transport material that can be oriented. The hole transport layer 40 is formed as an alignment forming film. The mesogenic polymer based luminescent material is then applied on top of the orientation forming film via e.g. solution processing. Therefore, molecules in one surface 30a of the light-emitting layer 30 in contact with the hole transport layer 40 can be oriented. Specifically, the hole transport layer 40 may include a polyimide-based polymer. For example, a polyimide-based polymer is thermally crosslinked through imidization at high temperature, and then subjected to a rubbing treatment in a predetermined direction. Accordingly, one face of the hole transport layer 40 may be oriented.

The organic light emitting device 100 may further include a hole injection layer HIL, an electron transport layer ETL, an electron injection layer EIL, and a combination thereof, in addition to the light emitting layer 30 and the hole transport layer 40. Known functional layers may also be included in the organic light emitting device 100 as needed.

For example, in fig. 1, the organic light emitting device 100 includes an electron transport layer 50 between the light emitting layer 30 and the second electrode 20.

The hole injection layer HIL may facilitate the injection of holes. The hole injection layer may be made of at least one selected from CuPc (copper phthalocyanine), PEDOT (poly (3, 4-ethylenedioxythiophene)), PANI (polyaniline), NPD (N, N-dinaphthyl-N, N' -diphenyl benzidine), and a combination thereof. However, the present disclosure is not limited thereto.

The electron transport layer ETL receives electrons from the second electrode 20. The electron transport layer ETL may transport the electrons providedTo the light emitting layer 30. The electron transport layer EML may be used to facilitate the transport of electrons. The electron transport layer EML contains an electron transport material. The electron transport material can be electrochemically stabilized by being anionic (i.e., by gaining electrons). Alternatively, the electron transport material may generate stable free radical anions. Alternatively, the electron transport material may comprise a heterocyclic ring to be readily anionized with a heteroatom. In one embodiment, the electron transport material may comprise a material selected from, for example, alq3 (tris (8-quinolinolato) aluminum), liq (8-quinolinolato platinum), PBD (2- (4-biphenylyl) -5- (4-tert-butylphenyl) -1,3,4-

Diazoles), TAZ (3- (4-biphenylyl) 4-phenyl-5-tert-butylphenyl-1, 2, 4-triazole), spiro-PBD, BALq (bis (2-methyl-8-quinoline) -4- (phenylphenol) aluminium), SAlq, TPBi (2, 2',2- (1, 3, 5-tribenzyl) -tris (1-phenyl-1-H-benzimidazole),. ANG>

Diazoles, triazoles, phenanthrolines, benzols>

At least one of oxazole and benzothiazole. However, the present disclosure is not limited thereto.

The electron injection layer EIL serves to facilitate injection of electrons and contains an electron injection material. The electron injecting material may include, but is not limited to, at least one selected from Alq3 (tris (8-hydroxyquinoline) aluminum), PBD, TAZ, spiro-PBD, BAlq, SAlq, and a combination thereof. Alternatively, the electron injection layer EIL may be made of a metal compound. The metal compound may include, but is not limited to, a metal selected from, for example, liQ, liF, naF, KF, rbF, csF, frF, beF ₂ 、MgF ₂ 、CaF ₂ 、SrF ₂ 、BaF ₂ And RaF ₂ At least one of (1).

In one implementation of the present disclosure, the organic light emitting device further includes an antireflection film 80. The antireflection film 80 is implemented as a circular polarizer.

Referring to fig. 3, the organic light emitting device 200 according to an example embodiment of the present disclosure may include an anti-reflection film 80 on an outer surface of the first electrode 10 or on an outer surface of the second electrode 20.

The anti-reflection film 80 may block the external light Lout such that the external light Lout is reflected inside the organic light emitting device 200 and is not transmitted to the viewer.

Referring to fig. 3, the external light Lout is in a non-polarized state before entering the organic light emitting device 200. When the external light Lout passes through the antireflection film 80, the antireflection film 80 may pass only light of a circular polarization direction corresponding to the circular polarization direction of the antireflection film 80. For example, when the circular polarization direction of the antireflection film 80 is a right-hand circular polarization direction, the external light Lout passing through the antireflection film 80 is right-hand circularly polarized. In contrast, when the circular polarization direction of the antireflection film 80 is the left-hand circular polarization direction, the external light Lout passing through the antireflection film 80 is left-hand circularly polarized. In fig. 3, in one embodiment, the circular polarization direction of the antireflection film 80 has a left-handed circular polarization direction. The external light Lout passing through the antireflection film 80 has a left-handed circular polarization state. The left-handed circularly polarized external light Lout travels in a direction toward the first electrode 10, and is then reflected by the first electrode 10. Thus, its direction of travel may be directed back to the antireflection film 80. Therefore, the circular polarization direction of the external light Lout has a right-handed circular polarization direction. Then, the external light Lout having the right-handed circular polarization direction travels to the antireflection film 80, but does not pass through the antireflection film 80. According to this principle, the external light Lout enters the inside of the organic light emitting device 200 and is blocked by the antireflection film 80 to prevent the viewer from seeing the reflected external light Lout.

In one embodiment, the internal light generated in the light emitting layer 30 may include the first light Lin1 toward the second electrode 20 and the second light Lin2 toward the first electrode 10. As described above, the internal light generated in the light emitting layer 30 has a circular polarization state. The light emitted from the light emitting layer 30 has a circular polarization direction identical to that of the antireflection film 80. In one embodiment, when the circular polarization direction of the antireflection film 80 is the left-handed circular polarization direction, the first light Lin1 has the left-handed circular polarization direction. The second light Lin2 has a right-hand circular polarization direction because the traveling direction of the second light Lin2 is opposite to the traveling direction of the first light Lin 1.

Since the first light Lin1 has the same left-handed circular polarization direction as the circular polarization direction of the antireflection film 80, the first light Lin1 may pass through the antireflection film 80 to reach the observer.

The second light Lin2 has a right-handed circular polarization direction and travels in a direction toward the first electrode 10. Then, the second light Lin2 may be reflected by the first electrode 10, and the traveling direction thereof may be guided back to the antireflection film 80. Therefore, the second light Lin2 whose moving direction is changed toward the antireflection film 80 has a left-handed circular polarization direction. Since the second light Lin2 having the left-handed circular polarization direction is the same as the circular polarization direction of the antireflection film 80, the second light Lin2 may pass through the antireflection film 80 to the viewer.

Accordingly, the organic light-emitting device 200 is configured such that both the first light Lin1 and the second light Lin2 generated from the light-emitting layer 30 pass through the antireflection film 80. Thus, the light transmittance of the device 200 is improved, and thus the light efficiency thereof is improved.

In one implementation of the present disclosure, an organic light emitting device is provided, including: a first electrode, a second electrode and a light emitting layer interposed therebetween, wherein the light emitting layer comprises a mesogenic polymer based light emitting material and a chiral dopant, wherein the light emitting layer has one face facing the first electrode and an opposite face facing the second electrode, wherein molecules of the mesogenic polymer based light emitting material in the one face are oriented in a first predetermined direction and molecules of the mesogenic polymer based light emitting material in the opposite face are oriented in a second predetermined direction different from the first predetermined direction, wherein the molecules of the mesogenic polymer based light emitting material are vertically arranged in a twisted manner based on a difference between the first predetermined direction and the second predetermined direction, thereby forming a twisted structure, wherein an angle of the second predetermined direction with respect to the first predetermined direction is defined as a twist angle, wherein the twist angle is in a range of 60 ° to 100 °.

In one implementation of the present disclosure, a method for manufacturing an organic light emitting device is presented, the method comprising: arranging a first electrode; forming a hole transport layer on the first electrode; applying an orientation to a top surface of the hole transport layer to form an orientation forming film of the hole transport layer; applying a solution on the alignment forming film and drying the solution to form a temporary light-emitting layer on the hole transport layer, wherein the solution includes a mesogenic polymer-based light-emitting material and a chiral dopant; applying an orientation to a top surface of the temporary light-emitting layer to have an orientation different from that of the hole transport layer; coating a photocurable polymer on the oriented top surface of the temporary light-emitting layer to form a coating layer, and then photocuring the coating layer; heating the temporary light emitting layer to form a light emitting layer having a twisted structure; removing the coating layer; and forming a second electrode over the light emitting layer.

Fig. 4 is a schematic illustration of a method for manufacturing an organic light-emitting device.

In fig. 4 (a), a thin film made of a Hole Injection Layer (HIL) material is formed on the cleaned patterned ITO glass (first electrode, anode). Next, a polyimide-based polymer as a material of a Hole Transport Layer (HTL) was formed into a thin film having a thickness of 15nm, and dried and heated to thermally crosslink the film via imidization. Then, the top surface of the film was rubbed by a rubbing device (first) to form an alignment forming film.

In fig. 4 (b), a mesogenic polymer-based luminescent material (F8 BT) was coated on the top surface of the orientation forming film.

In (c) of fig. 4, the top surface of the coating layer of the mesogenic polymer-based luminescent material (F8 BT) is rubbed using a rubbing device (second) to orient the top surface. The second rubbing direction is different from the first rubbing direction.

In (d) in fig. 4, a photocurable polymer is coated on the thus-oriented top surface of the coating layer of the mesogenic polymer-based luminescent material F8BT and fixed by photocuring.

In (e) of fig. 4, the mesophase is induced by heating the mesogenic polymer-based luminescent material (F8 BT) to a temperature higher than the glass transition temperature of the mesogenic polymer-based luminescent material (F8 BT), thereby distorting the molecular arrangement of the mesogenic polymer-based luminescent material (F8 BT) to form a distorted structure. Thus, a light emitting layer is formed.

In (f) of fig. 4, the photocurable polymer is removed. In the light emitting layer, the mesogenic polymer-based light emitting material polymer has a twisted structure.

In (g) of fig. 4, an Electron Transport Layer (ETL) and LiF/Al (second electrode, cathode) are sequentially stacked on the light emitting layer to manufacture an organic light emitting device.

Fig. 5 is a schematic cross-sectional view of an organic light-emitting device 300 obtained by the method of fig. 4. In fig. 5, the first electrode 10, the hole injection layer 60, the hole transport layer 40, the light emitting layer 30, the electron transport layer 50, and the second electrode 20 are sequentially stacked in this order. The light emitting layer 30 has a twisted structure. The specific description of the light-emitting layer 30 is as described above.

Fig. 6 is a schematic cross-sectional view of an organic light emitting display device 3000 including an organic light emitting device according to one embodiment of the present disclosure.

As shown in fig. 6, an organic light emitting display device 3000 may include a substrate 3010, an organic light emitting device 4000, and an encapsulation film 3900 covering the organic light emitting device 4000. A driving thin film transistor Td as a driving device and an organic light emitting device 4000 connected to the driving thin film transistor Td are positioned on the substrate 3010.

Gate lines and data lines defining pixel regions, power lines extending parallel to and spaced apart from the gate lines or the data lines, switching thin film transistors connected to the gate lines and the data lines, and storage capacitors connected to the power lines and one electrodes of the switching thin film transistors are formed on the substrate 3010.

The driving thin film transistor Td is connected to the switching thin film transistor and includes a semiconductor layer 3100, a gate electrode 3300, a source electrode 3520, and a drain electrode 3540.

The semiconductor layer 3100 is formed on the substrate 3010 and is made of an oxide semiconductor material or polycrystalline silicon. When the semiconductor layer 3100 is made of an oxide semiconductor material, a light blocking pattern may be formed under the semiconductor layer 3100. The light blocking pattern prevents light from being incident on the semiconductor layer 3100, thereby preventing the semiconductor layer 3010 from being deteriorated by light. Alternatively, when the semiconductor layer 3100 may be made of polycrystalline silicon, impurities may be doped into both edges of the semiconductor layer 3100.

On the semiconductor layer 3100, a gate insulating film 3200 made of an insulating material is formed over the entire surface of the substrate 3010. The gate insulating film 3200 may be made of an inorganic insulating material such as silicon oxide or silicon nitride.

A gate electrode 3300 made of a conductive material such as metal is formed on the gate insulating film 3200 and in a region corresponding to the middle region of the semiconductor layer 3100. The gate electrode 3300 is connected to the switching thin film transistor.

An interlayer insulating film 3400 made of an insulating material is formed over the gate electrode 3300 and over the entire surface of the substrate 3010. The interlayer insulating film 3400 may be made of an inorganic insulating material such as silicon oxide or silicon nitride or may be made of an organic insulating material such as benzocyclobutene resin or photo acrylic resin.

The interlayer insulating film 3400 has a first contact hole 3420 and a second contact hole 3440 defined therein for exposing two lateral portions of the semiconductor layer 3100, respectively. The first and

second contact holes

3420 and 3440 are spaced apart from the gate electrode 3300 and are disposed at both sides of the gate electrode 3300, respectively.

On the interlayer insulating film 3400, a source electrode 3520 and a drain electrode 3540 made of a conductive material such as metal are provided. The source electrode 3520 and the drain electrode 3540 are disposed around the gate electrode 3300 and spaced apart from each other. The source electrode 3520 and the drain electrode 3540 contact both sides of the semiconductor layer 3100 via the first contact hole 3420 and the second contact hole 3440, respectively. The source electrode 3520 is connected to the power line.

The semiconductor layer 3100, the gate electrode 3300, the source electrode 3520, and the drain electrode 3540 define a driving thin film transistor Td. The driving thin film transistor Td has a coplanar structure in which the gate electrode 3300, the source electrode 3520, and the drain electrode 3540 are disposed on the semiconductor layer 3100 in a coplanar manner.

Alternatively, the driving thin film transistor Td may have an inverted staggered structure in which the gate electrode is positioned below the semiconductor layer and the source and drain electrodes are positioned above the semiconductor layer. In this case, the semiconductor layer may be made of amorphous silicon. In one embodiment, the switching thin film transistor may have substantially the same structure as the driving thin film transistor Td.

In one embodiment, the organic light emitting display device 3000 may include a color filter 3600 absorbing light generated from the organic light emitting device 4000. For example, the color filter 3600 may absorb red (R) light, green (G) light, blue (B) light, and white (W) light. In this case, the color filter patterns absorbing red, green, and blue light may be individually disposed on a pixel basis. Each of these color filter patterns may overlap with a corresponding organic light emitting layer 4300 of the organic light emitting device 4000 emitting light having a corresponding wavelength. The organic light emitting display device 3000 can exhibit a full color range using the color filter 3600.

For example, when the organic light emitting display device 3000 is a bottom emission type, the color filter 3600 absorbing light may be located above the interlayer insulating film 3400 in the region of the organic light emitting device 4000. In an alternative embodiment, when the organic light emitting display device 3000 is a top emission type, the color filter may be positioned on the top of the organic light emitting device 4000, i.e., on the top of the second electrode 4200. In one embodiment, the color filter 3600 may have a thickness of 2 μm to 5 μm. In this regard, the organic light emitting device 4000 may be implemented as a white organic electroluminescent device having a series structure as shown in fig. 1 to 6.

In one embodiment, a protective layer 3700 having a drain contact hole 3720 exposing the drain electrode 3540 of the driving thin film transistor Td may be formed to cover the driving thin film transistor Td.

On the protective layer 3700, a first electrode 4100 connected to the drain electrode 3540 of the driving thin film transistor Td through the drain contact hole 3720 may be formed on a pixel region basis.

The first electrode 4100 may function as an anode and may be made of a conductive material having a relatively high work function value. For example, the first electrode 4100 may be made of a transparent conductive material such as ITO, IZO, or ZnO.

In one embodiment, when the organic light emitting display device 3000 is a top emission type, a reflective electrode or a reflective layer may also be formed under the first electrode 4100. For example, the reflective electrode or the reflective layer may be made of any one of aluminum (Al), silver (Ag), nickel (Ni), and aluminum-palladium-copper (APC alloy).

The organic light emitting display device 3000 is a bottom emission type in which light emitted from the light emitting layer 4300 passes through the first electrode 4100 and is output to the outside of the device 3000. Alternatively, the organic light-emitting display device 3000 is a top emission type in which light emitted from the light-emitting layer 4300 passes through the second electrode 4200 and is output to the outside of the device 3000. When the device 3000 is of a bottom emission type, an antireflection film as a circular polarizer is provided below the first electrode 4100. When the device 3000 is of a top emission type, an antireflection film as a circular polarizer is provided on the top surface of the second electrode 4200.

On the protective layer 3700, a bank layer 3800 covering the edge of the first electrode 4100 is formed. The bank layer 3800 exposes a central region of the first electrode 4100 corresponding to the pixel region.

A second electrode 4200 is formed on the organic light emitting layer 4300. The second electrode 4200 may be disposed over the entire display area, and may be made of a conductive material having a relatively low work function value, and may serve as a cathode. For example, the second electrode 4200 may be made of any one of aluminum (Al), magnesium (Mg), and aluminum-magnesium alloy (AlMg).

The first electrode 4100, the organic light emitting layer 4300, and the second electrode 4200 together define an organic light emitting apparatus 4000.

On the second electrode 4200, an encapsulation film 3900 is formed to prevent external moisture from penetrating into the organic light emitting device 4000. The encapsulation film 3900 may have a three-layer structure in which a first inorganic layer and an organic layer and a second inorganic layer are sequentially stacked. However, the present invention is not limited thereto.

Hereinafter, examples and comparative examples of the present disclosure will be described. These embodiments are merely examples of the present disclosure, and the present disclosure is not limited to these embodiments.

Examples

< production of organic light-emitting device >

CuPc as a Hole Injection Layer (HIL) material was vacuum deposited to a thickness of 2nm on the cleaned patterned ITO glass. Then AL22636 (from JSR) as a Hole Transport Layer (HTL) material was coated on the Hole Injection Layer (HIL) to a thickness of 15 nm. In this regard, the hole transport layer functions as an orientation forming layer. Then, the solvent was dried at 100 ℃ for 10 minutes. After the hole transport layer was heated at 210 ℃ for 60 minutes to thermally crosslink the hole transport layer via imidization, a first rubbing treatment was performed using a rubbing device to form an alignment forming film having a first rubbing direction. The orientation forming film may correspond to a top surface of the hole transport layer.

Then, as a material of the light emitting layer (EML), F8BT (4 wt% in toluene) as a mesogenic polymer-based light emitting material having the following structural formula and a chiral dopant having the following structural formula were mixed in toluene. The mixture is coated on the top surface of the hole transport layer and dried to form a temporary light emitting layer. The content of the chiral dopant was 3wt% with respect to the weight of the temporary light-emitting layer based on the solid content.

A second rubbing treatment is applied to the top surface of the temporary light emitting layer to form an anisotropic morphology having a second rubbing direction.

Then, a UV curable polymer (NOA 65, norland) is applied and UV cured on the top surface of the temporary light emitting layer, thereby fixing the orientation of the top surface of the temporary light emitting layer.

Then, the temporary light-emitting layer was heated to 150 ℃ to induce an intermediate phase, and then the NOA 65 was removed. Under the intermediate phase, a light emitting layer having a twisted structure is formed. The twisted structure is achieved by uniformly twisting the molecular arrangement of F8BT between the top surface and the bottom surface of the temporary light-emitting layer via the azimuthal anchoring energy generated in the first rubbing direction of the bottom surface and the azimuthal anchoring energy generated in the second rubbing direction of the top surface.

Then, an organic light emitting device was manufactured by sequentially depositing TPBi as an Electron Transport Layer (ETL) material to a thickness of 20nm on the top surface of the light emitting layer, then depositing LiF (1 nm) on the ETL layer, and then depositing Al (70 nm) on the LiF layer.

< structural formula of F8BT >

< chiral dopant Structure >

Examples 1 to 2

In embodiments 1 to 2, the angles of the second rubbing direction with respect to the first rubbing direction are set to 80 ° and 100 °, respectively.

Comparative examples 1 to 4

In comparative examples 1 to 4, the angles of the second friction direction with respect to the first friction direction were set to 0 °, 20 °, 40 °, and 60 °, respectively.

Comparative example 5

In the preparation of the organic light emitting device, the UV curable polymer (NOA 65, norland) was not coated and uncured on the top surface of the temporary light emitting layer having the orientation defined therein via the second rubbing process. Therefore, the orientation of the top surface of the temporary light-emitting layer is not fixed. Then, an organic light emitting device is manufactured by forming an electron transport layer on the light emitting layer. In comparative example 5, the angle of the second rubbing direction with respect to the first rubbing direction was set to 80 °.

Experimental example 1

The devices of examples 1 to 2 and comparative examples 1 to 4 were evaluated from PL spectrum and EL spectrum using spectrometry. Table 1 shows the twist angle θ T obtained from the PL spectrum evaluation results.

The Twist angle was measured using a measuring device having the Structure shown in FIG. 12 according to the method described in the article "Control of circular Polarized Electrical in Induced Twist Structure of joined Polymer, jae-Hoon Kim et al, adv. Mater.2017, 1700907". In this connection, the laser conditions were 5.0mW and 633nm wavelength.

[ Table 1]

Examples	Twist angle θ T
		Example 1	82°
Example 2	100°
		Comparative example 1	0°
Comparative example 2	20°
		Comparative example 3	33°5
Comparative example 4	52°
		Comparative example 5	56°

Fig. 7 shows PL spectra of examples 1 to 2.

Fig. 8 shows PL spectra of comparative examples 1 to 4.

Fig. 9 shows EL spectra of examples 1 to 2.

Fig. 10 shows EL spectra of comparative examples 1 to 4.

As can be seen from the results in table 1, each of the devices of example 1 to example 2 has a light emitting layer having a twisted structure with a large twist angle. As can be seen from fig. 7 to 10, the degree to which the left-hand circularly polarized LHCP predominates with respect to the right-hand circularly polarized RHCP is greater in the devices of example 1 to example 2 than in comparative example 1 to comparative example 4.

Experimental example 2

In order to evaluate the surface characteristics of the light emitting layers manufactured in example 1 and comparative example 5, texture images thereof were obtained by AFM (atomic force microscope) analysis.

Fig. 11 shows AFM textures obtained from the top surface of the light emitting layer before and after the second rubbing of the temporary light emitting layer during the manufacturing process of the light emitting layers manufactured in example 1 and comparative example 5, and AFM textures obtained from the top surface of the light emitting layer after the twisted structure is formed via heating.

Fig. 11 (a) shows the AFM texture of the top surface of the provisional light-emitting layer of comparative example 5 before the second rubbing.

Fig. 11 (b) shows the AFM texture of the top surface of the temporary light-emitting layer of comparative example 5 after the second rubbing. An anisotropic morphology is formed according to the second rubbing direction.

Fig. 11 (c) shows AFM texturing of the top surface of the light-emitting layer after formation of the twisted structure via heating in example 1. This confirms that the anisotropic morphology of the top surface is well maintained because the anisotropic morphology formed according to the second rubbing direction is fixed by a UV curable polymer (NOA 65, norland). Therefore, it can be seen that the twist angle of the light emitting layer thus formed is formed in proportion to the difference between the first rubbing direction and the second rubbing direction.

Fig. 11 (d) shows the AFM texture of the top surface of the light-emitting layer after the twisted structure is formed by heating in comparative example 5. The anisotropic morphology formed according to the second rubbing direction was not fixed by UV curable polymers (NOA 65, norland). Thus, the surface morphology has collapsed. Since comparative example 5 cannot maintain the second orientation of the top surface of the light emitting layer, the twist angle cannot be realized in proportion to the difference between the first rubbing direction and the second rubbing direction.

Experimental example 3

The transmission texture of the luminescent layer samples as prepared in examples 1 to 2 was evaluated using a laboratory instrument apparatus as shown in fig. 12.

Fig. 13 shows the transmissive textures obtained for the samples of the light emitting layers manufactured in examples 1 to 2.

Fig. 13 (a) shows the transmission texture obtained for the luminescent layer sample of example 1. Fig. 13 (b) shows the transmission texture obtained for the luminescent layer sample of example 2. The measuring device with the left-handed circular polarizer in fig. 12 was used to examine the circular polarization direction of the twisted structure of the light-emitting layer. When light passes through the left-handed circular polarizer and is left-handed circularly polarized, the light may pass through the light emitting layer having a twisted structure with a left-handed circular polarization direction. Therefore, light transmission increases. In contrast, when light passes through a left-handed circular polarizer and is left-handed circularly polarized, the light does not need to pass through a light emitting layer having a twisted structure with a right-handed circular polarization direction. Therefore, light transmission is reduced.

As can be seen from fig. 13 (a) and 13 (b), the left-hand twisted structure is very uniformly formed in all regions. That is, it was confirmed that in each of the light emitting layers in embodiment 1 and embodiment 2, the twisted structure was uniformly formed in which the left-handed circular polarization predominated over the right-handed circular polarization.

As described above, the present disclosure is described with reference to the drawings. However, the present disclosure is not limited to the embodiments and drawings disclosed in the present specification. It will be apparent to those skilled in the art that various modifications thereto can be made within the scope of the disclosure. Furthermore, although the effects obtained by the features of the present disclosure are not explicitly described in the description of the embodiments of the present disclosure, it is apparent that predictable effects obtained by the features of the present disclosure should be recognized.

Claims

1. An organic light emitting display device comprising:

a substrate;

a driving thin film transistor TFT on the substrate;

an organic light emitting device connected to the driving thin film transistor TFT; and

an encapsulation film covering the organic light emitting device,

wherein the organic light emitting display device is a top emission type,

wherein the organic light emitting device includes a first electrode, a second electrode, a light emitting layer interposed between the first electrode and the second electrode, a hole transport layer in contact with one surface of the light emitting layer, an electron transport layer between the light emitting layer and the second electrode, and an antireflection film on a top surface of the second electrode;

wherein the light-emitting layer comprises a mesogenic polymer-based light-emitting material and a chiral dopant,

wherein the light emitting layer has the one face facing the first electrode and an opposite face facing the second electrode,

wherein the molecules of the mesogenic polymer-based luminescent material in said one face are oriented in a first predetermined direction and the molecules of the mesogenic polymer-based luminescent material in said opposite face are oriented in a second predetermined direction different from said first predetermined direction,

wherein the angle of the second predetermined direction relative to the first predetermined direction is defined as a twist angle,

wherein molecules of the mesogenic polymer-based luminescent material are vertically arranged between the one face and the opposite face of the light emitting layer within the twist angle in a helically twisted manner to form a twisted structure,

wherein the twist angle of the light emitting layer is larger than a saturation twist angle of the mesogenic polymer-based light emitting material,

wherein the antireflection film comprises a circular polarizer,

wherein the circular polarization direction of the antireflection film is a left-handed circular polarization direction,

wherein the hole transport layer has an interface in contact with the light emitting layer,

wherein the interface has an orientation based on friction or optical orientation, an

Wherein the twist angle of the light emitting layer is in a range of 82 ° to 100 °.

2. The organic light-emitting display device according to claim 1, wherein the light-emitting layer contains the chiral dopant in a range of 0.1wt% to 30 wt%.

3. The organic light-emitting display device according to claim 1, wherein the hole transport layer comprises a polyimide-based polymer.

4. The organic light-emitting display device according to claim 1, wherein light emitted from the light-emitting layer has right-handed circular polarization or left-handed circular polarization.

5. The organic light-emitting display device according to claim 1, wherein an absolute value of a g-factor of light emitted from the light-emitting layer is in a range of 0.01 to 2.

6. The organic light-emitting display device according to claim 1, wherein the circular polarization direction of the antireflection film and a circular polarization direction of light emitted from the light-emitting layer are the same.

7. An organic light-emitting display device according to claim 1 wherein molecules of the mesogenic polymer-based luminescent material between the one face and the opposite face are oriented in a third direction different from the first predetermined direction and the second predetermined direction.

8. An organic light-emitting display device according to claim 7, wherein the third direction is different from the first predetermined direction and the second predetermined direction, and intersects both the first predetermined direction and the second predetermined direction.

9. A method for manufacturing the organic light-emitting display device according to claim 1, wherein the organic light-emitting device is manufactured by a method comprising:

providing a first electrode;

forming a hole transport layer on the first electrode;

applying an orientation to a top surface of the hole transport layer to form an orientation forming film of the hole transport layer;

applying a solution on the alignment forming film and drying the solution to form a temporary light-emitting layer on the hole transport layer, wherein the solution comprises a mesogenic polymer-based light-emitting material and a chiral dopant;

applying an orientation to a top surface of the temporary light-emitting layer to have an orientation different from an orientation of the orientation-forming film of the hole-transporting layer;

applying a photocurable polymer on the oriented top surface of the provisional light-emitting layer to form a coating layer, and then photocuring the coating layer;

heating the temporary light emitting layer to form a light emitting layer having a twisted structure;

removing the coating layer; and

a second electrode is formed over the light emitting layer.

10. The method of claim 9, wherein heating the temporary light emitting layer to form the light emitting layer with the twisted structure comprises heating the temporary light emitting layer to a temperature above a glass transition temperature of the temporary light emitting layer to induce an intermediate phase to form the twisted structure.

11. The method according to claim 9, wherein an angle between an orientation of one face of the light emitting layer in contact with the hole transport layer and an orientation of a face of the light emitting layer opposite to the one face is larger than a saturation twist angle of the mesogenic polymer-based light emitting material.

12. The method according to claim 11, wherein the molecules of the mesogenic polymer-based luminescent material between the one face and the opposite face are oriented in a third direction different from the first predetermined direction of the one face and the second predetermined direction of the opposite face.

13. The method of claim 12, wherein the third direction is different from the first predetermined direction and the second predetermined direction and intersects both the first predetermined direction and the second predetermined direction.